[The regulation of stat3 signal transduction pathway to G1 to S phase of laryngocarcinoma cell].
OBJECTIVE
To show that Stat3 played a key role in the G1 to S phase transition in laryngocarcinoma cells.


METHODS
Human laryngocarcinoma cell lines Hep-2 were transfected with Stat3 antisense oligonucleotide mediated by liposome, MTT assay was used to measure the proliferation, flow cytometry was applied to analyze the cell cycle, and the expressions of Stat3, phosphorylation specific Stat3 (tyrosine705), CyclinD1, Cyclin E, CDK2, CDK4, CDK6, p21 and p27 were detected by western blot.


RESULTS
Hep-2 laryngocarcinoma cell lines expressed constitutively activated Stat3. Antisense oligonucleotide which directed blocked up the translation site resulted in growth inhibition, downregulation of Stat3, p-Stat3, Cyclins and CDKs, and upregulation of p21 and p27.


CONCLUSIONS
Our findings suggested that Stat3 played an important role in the G1 to S phase transition in laryngocarcinoma cells, Stat3 orchestrated cell cycle by regulating the balance between CDK/Cyclin complex and CKI.
Wang
Junge
J
Department of Otorhinolaryngology, Hebei General Hospital, Shijiazhuang 050051, China.
Li
Xiaoming
X
Lu
Xiuying
X
Pi
Lihong
L
D045744:Cell Line, Tumor; D016193:G1 Phase; D006801:Humans; D007822:Laryngeal Neoplasms / Q000378:metabolism* / Q000473:pathology; D016196:S Phase; D050796:STAT3 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D014162:Transfection
D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human